Furnace sectional dead grate with brick inserts



May 22, 11923. 55 5 F. B. BIGELOW FURNACE SECTIONAL DEAD GRATE WITH BRICK INSERTS Filed Feb. 20, 1922 Patented May 22, 1923.

siren stares FRANK B. BIGELO'W, OF DETROIT, MICHIGAN, ASSIGNOB TO MURPHY IRON WORKS, OE

DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

Application filed February 20, 1922. Serial No. 537,720.

T all whom it M ay concern.

Be it known that I, FRANK B. BIGELOW, a citizen of the United States, residing at Detroit, in'the county of Vayne and State of Michigan, have invented certain new and useful Improvements in Furnace Sectional Dead Grates with Brick Inserts, of which the following is a specification.

The present invention concerns features of novelty and advantage resident in anew and improved style of dead-grate, such as are used at the ends of V-shaped and other grates in furnaces and automatic stoker construc tions.

' In such structures, the dead-grates act as retainers or confining appliances for the adjacent movable grate-bars, and as filling or spacing elements separating the rocking grate-bars from the end walls, hence pre venting the action of such oscillatory or movable grate-bars from causing wear. or damage to the brick'wall at the rear of the furnace,

These stationary dead-grates, by reason of the fact that no cooling air passes through them, and hence their characterization as dead grates, are equipped with refractory I brick inserts to protect them from the otherwise consuming heat to which they are sub jected.

tional to secure economy and simplicity in casting and to avoid the employment of cores, and accordingly these grate members may be made on molding machines, while solid ones cannot be so produced, and hence the sec tional ones can be manufactured much more cheaply than were they made solid or integral rather than in companion parts, as indicated in detail hereinafter.

Such division of the dead-grate into parts or sections facilitates the making of repairs as well as effecting an economy therein, because only the injured or damaged element need be replaced, the other or companion member being continued in use.

To enable those skilled in this art, and all others interested, to understand the new structure of dead-grate incorporated in the present invention,a desirable and preferred embodiment of the latter has been illus trated in detail in the accompanying draw- 4 ing forming a part of this specification, and to which reference should be had in connection with the following detailed description,

Such new grates are preferably made seclike reference characters, for convenience, being used for the same parts throughout the several views of the drawing.

In this drawing,--

Fig. 1 is a side elevation of one of the improved and novel styles of dead-grates vith brick inserts;

Fig. 2 is a' plan or top face view of the same with some of the. bricks omitted to more clearly show the structural features;

Fig. 3 is a fragmentary cross-section on an enlarged scale on line 33 of Fig. 1, the parts being viewed in the direction indicated by the arrows; and

Fig. 4: is a similar enlarged section on line By reference to the drawing, it will be perceived that the dead-grate as a whole consists of two registering or mating parts 11 and 12 which are alike except for the reversed location of their structural characteristics.

That is to say, one of these elements may be considered as a right-hand structure and the companion part as a matching left-hand element.

Each such grate section or part at its top end has an external, plane or smooth surface 18 disposed vertically when the section is inclined as it is ordinarily used in association with one half of a V-shaped grate, suchas is commonly embodied in the well-known Murphy style of furnace, such smooth or plain face being adapted to rest against the inner wall of an air-flue beneath the cokingplate over which the fuel is fed to the main grate by suitable, reciprocatory stokerboxes.

This construction of stoker is well known and need not be. here shown, the present invention residing solely in the dead-grate bars,

At. its lower end, each such dead-grate element has a socket or recess 14 adapted to accommodatethe toppart of a verticallydisposed, horizontally-arranged, supporting plate at the side of the usual clinker-grinder, it being understood that one each of such dead-grate members is used for each side. or half of the V-shaped grate and in substantial register therewith, being supported and maintained in place by'the plate referred to. i 7

Each such grate element comprises a vertically-arranged, side web or, plate 15 extended the full width of the structure, and for the greater part of its length provided with a laterally-disposed, longitudinal ledge 16 located practically midway between its bracket portions 17.

upper and lower edges, the ledge 16 and the part being united at intervals by In register with such brackets or braces,

'- the ledge is of full width, as is also the bracket, but between the brackets tliewidth of the ledgeis slightly redu-cedat 18, as is clearly indicated in Figs. 2 and 4t, whereby in finishing or smoothing such edge of the ledge a comparatively small I amountof metal only need be removed to get the com-f panion castings to'tit together properly. I

upper portions of the two dead-grate ele-' ments are detachably fastened together by a bolt 23. accommodated in the aligned holes of the'two mating parts 22, the head of the bolt and the nut for its threaded shank being housed in the external recesses provided by such offset portions.

In order to secure an adequate abutting relation of the two dead-grate members at I this point adjacent to the holding or fasten- 'ing bolt, each such element below its iiiwardly-projecting ledge, and desirably below the uppermost bracket 17, is equipped or provided with another brace or bracket 1 24 forming "an integral portion of the casting, the inner edges of such parts 2% bearing on one another when the dead-grate elements are bolted together as described.

At the other end or lower portion of the dead-grate downwardly immediately beyond the lowermost portions 17 and just below the top plates 20, the two webs 15 are formed to provide a pair of inwardly-oifset apertured parts 25, 25, which are secured firmly together by a bolt 26 or'other suitable fastener occupying the registering holes of such parts and-having its head and nut received in the external pocketsthereof.

A pair of dead-grate castings when thus bolted together form a complete deadgrate, of which two oppositely sloping ones are usedwith a V-shaped'grate, and each pair of castings thus united provides a plurality of pockets, in the present instance five,. in the top face thereof, each such pocket being adapted and designed to receive one of the refractory bricks 27, .the upper one being slightly different in shape from the others in view of the somewhat different form of the corresponding pocket. i

It will be observed that these cavities or pockets, by reason ofenlargements 28 along the top edges of webs or plates 15, or by any other appropriate means, are slightly,

narrower at their tops than at their bottoms, and accordingly this construct-ion permits the insertion of the bricks when the bolts are loosened up, whereupon the bricks are 'firinly and fixedly clamped in their sockets upon tightening the bolts.

With this arrangementthere is no danger of unintentional dislodgment or displacement of the bricks or any possibilityof .un designed removal thereof."

A consideration of the structural and functional characteristics of the new, and improved dead-grate will indicate the acpurposes of the invention specified above, as well as other nherent advantages.

Those having a knowledge of this art will complishment of the severalobjects and readily understand that the invention is not limited and restricted to the precise and exact details of structure presented, since these are capable of. radical modifications without departure from the-heart and essence of theinvention as defined by the appended claims, and'without the sacrifice A of any of, its substantial benefits and advantages. i v

1 claim:

' 1. A furnace dead-grate, comprising in combination a pair of reversely-shaped castmetal members adapted to be'fastened together with their corresponding parts: in

register, each of such members having a substantially vertically-disposed plate with;

an inwardly-extended ledge on its inner face for the greaterportion of its length between its upperand lower edges,"a plurality of spaced braces'joining the top face of said said lowermost brace having an-finwa rdly-r offset apertured part, and means in such latter registering apertures of'the companion grate members fastening the latter together, the plates, ledges and upper braces of said members unitedly forming brick-re ceiving pockets narrowest near their tops UK I whereby the bricks may be clamped firmly in such pockets by the tightening of said fastening means.

2. A furnace dead-grate comprising in combination a pair of reversely-shaped castmetal members adapted to be fastened together with their corresponding parts in register, each of such members having a substantially vert-ically-disposed plate with an inwardly extended ledge on its inner face for the greater portion of its length between its upper and lower edges, a plurality of spaced braces joining the top face of said ledge with the inner face of said plate, a brace beneath one of said upper braces connecting the lower face of said ledge with the inner face of said plate beneath said ledge,

said plate having an inwardly-offset apertured part adjacent to said lower brace and below said ledge, means in the registering apertures of said members fastening the latter together, each of said dead-grate members having an inwardly-extended plate-section along its top edge below the lowermost brace above the ledge, each plate beneath said top plate-section and adjacent to said lowermost brace having an inwardlyoflset apertured part, and means in such latter registering apertures of the companion grate members fastening the latter together.

A furnace dead-grate comprising in combination a pair of reversely-shaped castmetal members adapted to be fastened together with their corresponding parts in register, each of such members having a vertically-disposed plate, a longitudinal inwardly-extended ledge on the inner face of said plate between its upper and lower edges, a top platesection extended inwardly along the upper edge of the lower part only of said plate, means below said registering ledges to fasten said members together, and means below said top platesections to secure said members together.

a. A furnace dead-grate comprising in combination a pair of reversely-shaped cast metal members adapted to be fastened together with their corresponding parts in register, each of said members having a vertically-disposed plate, a longitudinal inwardly-extended ledge on the inner face of said plate between its upper and lower edges, spaced braces connecting said ledge and plate, a top plate-section extended inwardly along the upper edge of the lower part only of said plate, and means to fasten said members together, said ledges, braces and plates conjointly forming brick-receiving pockets on the top face of the grate.

A furnace dead-grate comprising in combination a pair of reversely-shaped cast metal members adapted to be fastened together. with their corresponding parts in register. each of said members having a vertically-disposed plate, a longitudinal in wardly-extended ledge on the inner face of said plate between its upper and lower edges, spaced braces connecting said ledge and plate, and means to fasten said members together, said ledges, braces and plates conjointly forming brick-receiving pockets on the top face of the grate.

6. A furnace dead-grate comprising in combination a pair of reversely-shaped members adapted to be fastened together with their corresponding parts in register, and means to so secure said members to gether, each of the latter having a verticallydisposed plate, an inwardly-projecting ledge positioned longitudinally of said plate between its upper and lower edges, and an inwardly-extended plate-section along the lower portion only of the top edge of said plate, said plate-section having a plurality of transverse ribs across its top face,

7. A furnace dead-grate comprising in combination a pair of reversely-shaped members adapted to be fastened together with their corresponding parts in register, and means to so secure said members together, each of the latterhaving a vertically-disposed plate, an inwardly-projecting ledge positioned longitudinally of said plate between its upper and lower edges, and an inwardly-extended platesection along the lower portion only of the top edge of said plate.

8. A furnace dead-grate comprising in combination a pair of reversely-shaped companion members forming conjointly on their top faces when in register brick-receiving pockets the walls of which are adapted to clamp the bricks fixedly in such pockets, and means to fasten said members together in such register.

9. A furnace dead-grate comprising in combination a pair of reversely-shaped companion members forming conjointly on their top faces when in register brick-receiving pockets narrower at their tops than elsewhere, and means to fasten said members together in such register whereby the walls of said pockets are designed to clamp the bricks firmly in such pockets.

10. A furnace dead-grate comprising in combination a pair of companion members conjointly forming brick-receiving pockets on their top faces when in register, and means to fasten said members together in the relation specified.

11. A furnace-dead-grate section having a plate with an inwardly-extended ledge on its inner face for the greater portion of its length between its upper and lower edges, a

plurality of spaced braces joining the top face of said ledge with the inner face of said plate, a brace beneath one of said'upper braces connecting the lower face of said ledge with the inner face of said plate beneath said ledge, said plate having an inwardly-offset apertured part adjacent to said lower brace and below said ledge, said plate alsohaving an inwardly-extended platesection along its top edge below the lowermost brace above the ledge, said plate beneathv said top plate-section and adjacent to said lowermost brace having aninwardlyoffset apertured part.

12. A furnace dead grate section having a plate, a longitudinal inwardly-extended ledge on the inner face of said plate between its upper and lower edges, and a top plate-section extended inwardly along the upper'edge of the lower part only of said l plate.

13. A furnace dead-grate section having a plate, a longitudinal inwardly-extended ledge on the inner face of the plate between its upper and lower edges, spaced bracesconnecting said ledge and plate, and a top plate section extended inwardly along the upper edge of the lower portion only of the platen 14-. A furnace dead-grate section having a plate, a longitudinal inwardly-extended ledge on the inner face of said plate between its upper and lower edges, and spaced braces connecting said ledge and plate, said ledge, braces andpla-te forming parts of brick-receiving pockets.

FRANK B. BIGELOlV. 

